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Re:Paradox-free time travel is theoretically possible by littlestymaar on Thursday January 21, 2021 @07:36AM (#25858217)
> What does that even mean

Any variation on this: “sending this item in the past, will grab the same amount of mass from the past, taken at random in a way that preserve the energy on both ends”

Re:Paradox-free time travel is theoretically possible by 194765 on Thursday January 21, 2021 @08:21AM (#25858519)
So like the gate of truth from Fullmetal Alchemist?